Give schematic representation of hypothalamic hypophyseal portal system.

The hypothalamus is the basal part of the diencephalon lying below the thalamus. It forms the walls and lower part of the third ventricle of the brain.

• It induces the optic chiasm, the tuber cinereum, the infundibulum and the mammillary bodies.
• The lower part of the tuber cinereum, which is richly supplied with blood vessels that drain into the pituitary stalk and then in turn empty into a secondary plexus in the anterior pituitary, is referred to as the median eminence.
• The vascular link between the median eminence and the pituitary gland is known as the hypophysial portal system.
• The hypophyseal portal system is a system of blood vessels in the brain. 
• Its main function is the transport and exchange of hormones to allow a fast communication between both glands.
• Within the hypothalamus are clusters of neurons, hypothalamic nuclei, which are symmetrically located around the third ventricle.
• The supraoptic nuclei (SON) and paraventricular nuclei (PVN) are composed of cell bodies whose axons extend into the median eminence and then into the neurohyposis.
• This particular nerve tract, consisting of neuronal axons from the SON and PVN, is the supraopticoparaventriculohypophysial tract. 
• Other major nuclear groups within the hypothalamus include the ventromedial nuclei, arcuate nucleus, lateral tuberal nuclei and dorsomedial nuclei.
• The neural hypophyseal stalk and ventromedial region of the hypothalamic arcuate nucleus receive arterial blood from ascending and descending infundibular branches and capillaries, coming from the arteries of the superior hypophyseal arterial system.
• Small ascending vessels arising from the anastomoses that connect the upper and lower hypophyseal arterial system also supply blood to hypophyseal vessels.
• The majority of these branches penetrate into the neural tissue to break up into capillaries for rapid hormone exchange.